Showing 7 results for Rezaei
Majid Amani, Nader Hassanzadeh, Saeid Rezaei,
Volume 1, Issue 1 (3-2012)
Abstract
In 2005, Circular to elliptical brown necrotic leaf spots, were observed on young leaves of Banana(Musa acuminata L.) plantion under plastic cover in Mazandaran&Gorgan provinces. The rhizomes and pseudostems were not affected. A gram-negativebacterium with yellow mucoid colonies was isolated from the leaves on sucrose and glucose nutrient agar. All isolates were negative in oxidas, and positive in catalase reaction. Non of isolates did not produce green or blue pigment on KB medium. On the basia of phenotypic charachteristics pathogenicity test was confirmed with inocoulation of bacterial suspension to Banana plants. The causal agent of bacterial necrotic and leaf spot of banana was recognized asXanthomonascampestris. This is the first report ofbacterial necrotic and leaf spot of banana in Iran.
Rasool Rezaei,
Volume 4, Issue 1 (3-2015)
Abstract
Rezaei R. 2015. Pathogenicity and virulence factors of plant pathogenic bacteria. Plant Pathology Science 4(1):23-33.
Plant pathogenic bacteria have evolved specialized strategies to infect their hosts. In this regard, the key virulence factors are effector proteins, cell wall degrading enzymes, toxins, extracellular polysaccharides and phytohormones. The interactions between plant pathogenic bacteria and their hosts have resulted in an evolutionary system between host defense responses and pathogen virulence factors. Pathogenic bacteria are continually under pressure to diversify their mechanisms to prevent host defenses and optimize nutrient availability. In turn, these virulence mechanisms have shaped the evolution of plant innate immunity. In this paper, the pathogenicity and virulence factors of plant pathogenic bacteria are discussed.
, Rasool Rezaei,
Volume 5, Issue 1 (2-2016)
Abstract
Parad M. & Rezaei R. 2015. Citrus greening disease. Plant Pathology Science 5(1):37-47.
Citrus greening or Huanglongbing, is one of the most devastating disease of citrus worldwide. It is common in the southeast of Asia and is also recently reported from south provinces of Iran. It is caused by Liberibacter sp. that tend to colonize in phloem vessels of the host. This bacterium affects all of the main types of citrus plants and reduces fruit production. One of the identifying challenges is that some of the disease symptoms are similar to deficiency of some nutrient such as zinc. The most important vectors of the disease causal agent are some psylla species. The only worthwhile control measure is removing the microbial inoculums from the affected tissues. Management of the disease described in this paper.
Seyyed Taha Dadrezaei, Mohammed Torabi,
Volume 5, Issue 2 (8-2016)
Abstract
Dadrezaei S. D. & Torabi M. 2016. Management of wheat rusts. Plant Pathology Science 5(2):81-89.
Wheat is the most important crop in the world and rust diseases cause the most damage to wheat all over the years. There are so many ways to control the disease that the use of resistant cultivars is the most effective and economic way for disease control. Rust has high pathogenicity diversity and evolutionary aptitude. On the other hand, migration and mutation leads to the emergence of non-native races of rusts in a region so virulent pathotypes with the new structures and violence on resistance genes in commercial resistant cultivars were incidence and cause disease in resistant varieties and spread in the wheat fields. Development of effective and sustainable control methods against plant diseases is very much dependent on our knowledge of the disease in our country. This paper introduces wheat important rusts diseases and explains Factors affecting the prevalence, distribution, and relation of air currents in the transmission of rusts and strategies for monitoring and management of rusts in the country.
Rasool Rezaei,
Volume 9, Issue 1 (3-2020)
Abstract
Rezaei R (2020) Effect of eight essential oils on bacterial canker disease in citrus. Plant Pathology Science 9(1):30-39. DOI: 10.2982/PPS.9.1.30.
Introduction: Citrus bacterial canker caused by Xanthomonas citri subsp. citri is an economically important disease in many tropical and subtropical countries. Several pathotypes of this pathogen have been described which, in addition to certain genotypic features, are distinguished above all by their geographical origin and their host range. Citrus bacterial canker disease is wide spread in Iran and a major threat to the production of Mexican lime (Citrus aurantifolia). Therefore, management of citrus canker is inevitable in citrus growing areas where citrus canker has been established. Application of copper-based bactericides is a standard control measure for management of citrus canker worldwide. Therefore, their long-term use leads to the development of resistant isolates. Plant extracts and essential oils with an antimicrobial effect have become particularly important as an environmentally friendly method for the treatment of plant diseases. Many researchers have recently focused on studying plant extracts and essential oils that contain antimicrobial compounds. Material and Methods: The present study was carried out on the antibacterial effect of Common yarrow (Achillea millefolium), Ginger (Zingiber offcinale), Golden marguerite (Anthemis tinctoria), Fennel (Foeniculum vulgare), Common sage (Salvia officinalis), Gum tragacanth (Astaragalus gossypinus), Summer savory (Satureja hortensis) and True cardamom (Elettaria cardamomum) against two pathotype of Xanthomonas citri subsp. citri under laboratory and greenhouse conditions. Results: All essential oils have an inhibitory effect on multiplication of Xanthomonas citri subsp. citri. The antibacterial test results showed that the essential oils of Ginger and True cardamom strongly inhibited the growth of Xanthomonas citri subsp. citri pathotype, especially the pathotype A*, whereas other essential oils showed moderate to weak activities. Conclusion: The essential oils of these eight plants, especially ginger and cardamom, have good potential for the management of citrus bacterial canker.
Somayeh Vahabi, Habiballah Charehgani, Mohammad Abdollahi, Rasool Rezaei,
Volume 10, Issue 2 ((Spring and Summer) 2021)
Abstract
Vahabi S, Charehgani H, Abdollahi M, Rezaei R (2021) Response of eight melon cultivars to Meloidogyne javanica. Plant Pathology Science 10(2):65-73. Doi: 10.2982/PPS.10.2.65.
Introduction: The Root-knot nematodes (Meloidogyne spp.) are one of the most damaging plant pathogens with a wide host range and cause major losses to agricultural crops. The use of resistant cultivars is considered a safe, economical, and effective method to control these nematodes. Materials and Methods: In the present study, eight melon cultivars namely Ahlam, 105, Tracey, Ronak, Deltagrin, Mac, Holar, and Veno were evaluated for their response to M. javanica. The seeds were planted in 2 kg pots and maintained under natural conditions in Khormuj city, Bushehr province. Seedlings at the four-leaf stage were inoculated with 5000 eggs and second-stage juveniles. The factorial experiment was conducted in a completely randomized design with five replicates. Sixty days after nematode inoculation, the plants were harvested and the plant growth and nematode population indices were evaluated. Results: The results showed that the nematode reproduction factor was significantly lower in Ronak, Deltagrin, and Veno than in the other cultivars. No significant difference was observed in shoot fresh weight of nematode inoculated and non-inoculated plants of Ronak cultivar. Conclusion: Ronak, Delta-green and Veno cultivars are less susceptible to M. javanica.
Seyed Moslem Hosseini, Mostafa Darvishnia, H R Hossein Rezaeinejad, Eidi Bazgir, Fatemeh Darvishnia,
Volume 11, Issue 2 ((Spring and Summer) 2022)
Abstract
Hosseini SM, Darvishnia M, Rezaei Nejad A, Bazgir E, Darvishnia F (2022) The effect of essential oils of thyme, peppermint, savory and two fungicides on the growth of three plant pathogenic fungi. Plant Pathology Science 11(2):52-60. Doi:10.2982/PPS.11.2.52
Introduction: Some plant essential oils have antifungal properties. This study was conducted to determine the effect of three plant essential oils and two chemical fungicides on the growth of three plant pathogenic fungi in vitro. Materials and methods: The effect of different concentrations of three essential oils of thyme (Thymus vulgaris L.), peppermint (Mentha piperata L.) and khuzestani savory (Satureja khuzestanica Jamzad), compared to two chemical fungicides; mancozeb and carbendazim were investigated on the growth of three fungi Alternaria solani, Botrytis cinerea and Fusarium solani by dilution in Yeast Extract Sucrose Broth medium method and their minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) were calculated. Results: Thyme essential oil had the greatest inhibitory effect on A. solani and F. solani among these essential oils, and savory essential oil had the greatest inhibitory effect on B. cinerea. Among the chemical fungicides, mancozeb had the most inhibitory effect on A. solani and carbendazim had the most inhibitory effect on B. cinerea and F. solani. Conclusion: Thyme and khuzestani savory essential oils have a significant inhibitory effect on the growth of these three plants pathogenic fungi.
